I almost always used the power button to hang up. Is there any way to edit the call screen and rearrange some of the buttons? Or any custom screens/apps? I would love a custom call screen with a tiny "end call" button in the corner, and a big speaker button in the middle.

XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality.Are you a developer?